Tektite (Natural Glass)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Smoky Quartz

Quartz (SiO₂)

Tumbled-looking granite pebble

Granite, chiefly quartz–feldspar with biotite/amphibole

Tumbled black-and-white stone, likely dendritic agate or jasper

Cryptocrystalline quartz (SiO₂), possibly chalcedony with manganese-oxide dendrites

Chert / Flint

Silicon Dioxide (SiO2)

Druzy Quartz Geode (likely Smokey Quartz variety)

Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.

Biotite-bearing granite or granitic gneiss

Quartz–feldspar granite with biotite and accessory mica/amphibole

Unakite-like granite

Altered granite, chiefly quartz, feldspar, mica, and red garnet

Amethyst Geode

Quartz (SiO₂) with iron impurities

Amethyst

Quartz (SiO2) with trace iron impurities

Tumbled carnelian

Carnelian, a red-orange variety of chalcedony (microcrystalline quartz, SiO₂)

Amethyst

Quartz (Silicon Dioxide, SiO2)

Polished carnelian/chalcedony

Carnelian, a red-orange variety of microcrystalline quartz (SiO₂)

Quartzite

Quartzite (SiO2)

Unknown Organic Object (likely a berry or fruit)

Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.

Sandstone (Red Arkose)

Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions - SiO2)

Halite

Halite (NaCl)

Amethyst

SiO2 (Silicon Dioxide with Iron impurities and natural radiation influence)

Rose Quartz

Rose Quartz (SiO2)

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

Amethyst

Quartz (SiO2)

Peridot (Olivine)

Olivine, (Mg,Fe)2SiO4

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide with Iron and Titanium impurities)

Topaz

Topaz (Al2SiO4(F,OH)2)

Rough amber-like brown mineral specimen

Uncertain from photograph; possibly iron-stained quartz, common opal, or resinous amber

Granite

Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Halite

Halite (Sodium Chloride - NaCl)

Chalcedony

Chalcedony (a microcrystalline variety of Quartz, SiO2)

Milky Quartz

Quartz (SiO₂)

Amethyst

Quartz (SiO2) variety

Himalayan Salt

Halite (mineral name), chemical formula NaCl (sodium chloride). Generally, 'Himalayan Salt' is a trade name for evaporite minerals from specific regions.

Blue Lace Agate

Chalcedony (a form of Quartz) - SiO2

Quartz (likely Clear Quartz or Rock Crystal)

Quartz (SiO2)

Granite (weathered pebble)

Granite (plutonic igneous rock)

Tiger’s eye

Quartz variety, primarily silicon dioxide (SiO₂); fibrous quartz pseudomorph after crocidolite asbestos

Likely serpentine (serpentinite) pebbles

Serpentine-group minerals, chiefly antigorite, lizardite, and/or chrysotile; commonly Mg₃Si₂O₅(OH)₄, sometimes containing magnetite, chromite, and minor carbonate minerals

Pegmatite (likely Granitic Pegmatite)

Pegmatite (a coarse-grained igneous rock, often with granitic composition)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Banded Agate (likely Carnelian Agate or Sardonyx)

Agate is a common name for a microcrystalline variety of Quartz (SiO₂), specifically a form of Chalcedony.